Here is a simple and healthy smoothie with yogurt and kala jamun..
Jamuns ... 1 cup (about 10 -12 cut into pieces)
Yogurt .... 1 cup
Sugar ...... 2 tsps (you can substitute it with honey)
Salt ...... 1 pinch to balance the taste.
1. Blend all the ingredients together in a mixie adding sufficient water. Use cold water or some ice cubes.
2. Serve chilled.
Note: you can add some granola to make it more filling if you like.